Microsoft's Path Guide is an unconventional approach to indoor navigation

Indoor mapping is one of those stubborn problems that seems to only have solutions that involve a great deal of money and infrastructure: beacons, lasers, emitters, scanners who wants to install those in malls and office complexes across the world? Microsoft Research has produced an indoor navigation app that keeps things simple, utilizing existing sensors and the fact that people already go most of the places you want to go.

Path Guide is an app currently available only on Android that focuses on the navigation part of indoor mapping. It makes no attempt to visualize the entire volume in which the user is traveling, but trusts other users to create traces to and from static locations.

It uses the sensors already in the phone, from accelerometers (to count steps) to magnetometers (to sense the general area where one is starting). No need for GPS, wireless beacons or anything like that.

For example, one trace might take you from the front entrance of the office building to a certain meeting room on the 12th floor. Someone would open the app while in the lobby, start the trace then walk normally to the room. The next person would follow that trace, which has been processed and rendered into basic navigational stages: in 20 steps, take a right, that sort of thing.

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